The Application Sharing Server encountered an error when requesting credentials from the A/V Authentication Service. Cause: ...

Lync Server 2010

The Application Sharing Server encountered an error when requesting credentials from the A/V Authentication Service.

Cause: The Application Sharing Server could not establish secure TLS session with the Microsoft Lync Server 2010 Front End Service.
Resolution:
Check the Microsoft Lync Server 2010 Front End Service is alive and that network connectivity exists.

The Application Sharing Conferencing Server successfully sent notifications to the focus at %1. Any previous errors have ... The Application Sharing Server encountered an error when changing the TLS Certificate. Exception: %1 Cause: Invalid Certificate. ... The Application Sharing Server encountered an error when requesting credentials from the A/V Authentication Service. A/V ... The Application Sharing Server encountered an error when requesting credentials from the A/V Authentication Service. Cause: ... The Application Sharing Server encountered an error when requesting credentials from the A/V Authentication Service. Cause: ... The Application Sharing Server failed to send a notification to the Conferencing Focus service. Conference URI: %1, Focus ... The Application Sharing Server failed to start. Exception: %1 Cause: Startup errors. Resolution: Check the events prior to ... The Application Sharing Server has failed to create a conference because of an internal failure. Conference URI: %1 Exception: ... The Application Sharing Server SIP Listening port is not available. Cause: Sip listening is configured incorrectly. Resolution: ...